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GRA YLAND ENVIRONMENTAL CONSULTING SERVICES October 16, 2003 022-370 OCT 2 1 2003 hN Mr. Michael Walton pER` IMHEALTH SERVICES Walton Engineering, Inc. P.O. Box 1025 West Sacramento, California 95691 Subject: Underground Storage Tank and Fuel Dispenser Removal Report Bonfare Market, 15 Grant Line Road, Tracy, California Dear Mr. Walton: At your request,a registered geologist from Grayland Environmental(Grayland)arrived at Bonfare Market(site)located at 15 Grant Line Road in Tracy, California, on September 12, 2003,to assist with the removal of one underground storage tank and with fuel dispenser and product line replacement work. The storage tank removal and underground fuel system renovation work was conducted by Walton Engineering, Inc., of West Sacramento, California. The purpose of our work was to evaluate the possibility that soil beneath an underground waste oil storage tank and beneath five former gasoline dispensers, including four underground product line locations, had become contaminated with petroleum-based fuel hydrocarbons, as a result of the operation of the underground storage tank and/or fuel dispensing system at the site. The objective of our work was to collect a soil sample from beneath the former underground storage tank, each fuel dispenser and product line location for chemical analysis at an environmental laboratory. The soil sample collection work was directed and supervised by an Environmental Health Specialist from San Joaquin County Environmental Health Department(SJCEHD). SITE DESCRIPTION The site was situated at the northeastern corner of Holly Drive and Grant-Line Road in Tracy, California (Figure 1). At the time of our subsurface soil investigation, the site was occupied by Bonfare Market, an active fuel dispensing station and convenience store. The approximate 2,400- square-foot, concrete building at the site, was situated near the northern end of the site(Figure 2). Site operations included the use of three underground gasoline storage tanks, which at the time of our investigation, were partially exposed for system renovation; and one underground waste oil storage tank,which was unearthed and prepared for removal(T1 on Figure 2). The single concrete fuel dispenser island contained five dispensers and was situated sub-parallel to Grant Line Road near the southern end of the site (Figure 2). The surface of the site was covered predominantly with asphaltic-concrete,while the partially removed storage tank pad and drive slab surrounding the fuel dispenser island were made of concrete. 1807 Valdora Street Davis, California 95616 (530) 756-1441 Grayland 022-370.fdr 1 Odober 16,2003